need library js-file-downloader
此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.greasyfork.org/scripts/485684/1317487/Downloader%20JS%20File.js
class Downloader {
MAX_DOWNLOAD = 5;
PAUSE_TIME = 1000;
progress = 0;
status = false
constructor({ pause } = {}) {
if(jsFileDownloader === undefined) {
throw new Error("Can't make instance");
}
if(pause) this.PAUSE_TIME = pause;
let css = document.createElement("style");
css.innerText = `.downloader-container{background-color:#2f4f4f;width:calc(100% - 12px);max-width:520px;min-height:64px;position:fixed;bottom:10px;left:50%;transform:translateX(-50%);border-radius:8px;padding:.5em .75em;box-shadow:3px 4px 11px 0 #0000003b}.downloader-container .header{display:flex;justify-content:space-between;align-items:center;padding-bottom:.5em;border-bottom:1px solid #e2e2e259}.downloader-container .header h4{font-size:1.25em}.downloader-container .body{padding:.75em 0}.downloader-container .body ul{list-style-type:none;display:flex;flex-direction:column;gap:.25em}.downloader-container .body .file-item{display:flex;justify-content:space-between;gap:4px;background-color:#fff;padding:.25em;border-radius:4px}.downloader-container .body .file-item p{font-size:1em}`;
document.head.append(css);
this.urls = []
this.__makeContainer();
this.__makeHeader();
this.__makeBody();
}
__makeContainer() {
this._container = document.createElement("div");
this._container.classList.add("downloader-container")
}
__makeHeader() {
this._header = document.createElement("div");
this._header.classList.add("header");
let title = document.createElement("h4");
title.innerText = "Downloader";
this._count_files = document.createElement("p");
this._count_files.addEventListener("update", (e) => {
const { current, total } = e.detail;
this._count_files.innerText = `${current}/${total}`;
})
this.updateProgress(0);
this._header.append(title, this._count_files);
this._container.append(this._header);
}
__makeBody() {
let body = document.createElement("div");
body.classList.add("body");
this.__containerItem = document.createElement("ul");
this.__containerItem.classList.add("files-containter")
body.append(this.__containerItem);
this._container.append(body);
}
__makeItem(title) {
const item = document.createElement("li");
item.classList.add("file-item");
const titleContainer = document.createElement("p");
titleContainer.innerText = title;
const progress = document.createElement("span");
progress.innerText = "0%"
item.append(titleContainer, progress);
function updateProgress(percent) {
progress.innerText = `${percent} %`
}
return {
item,
updateProgress,
}
}
add_url(url, { title } = {}) {
if(title === undefined) {
title = `File - ${this.urls.length}`;
}
this.urls.push({ url, title })
this.updateProgress(0)
}
add_urls(urls) {
for(const item of urls) {
add_url(item.url)
}
}
async __download(url, title) {
const downloadContainer = document.createElement("li")
const progressFile = this.__makeItem(title || "File");
this.__containerItem.append(progressFile.item);
const process = (event) => {
if (!event.lengthComputable) return; // guard
var downloadingPercentage = Math.floor(event.loaded / event.total * 100);
console.log(downloadingPercentage)
progressFile.updateProgress(downloadingPercentage)
};
new jsFileDownloader({ url, process })
.then(async () => {
progressFile.updateProgress(100);
await new Promise(res => setTimeout(() => res(), 500));
progressFile.item.remove();
Promise.resolve(true)
})
.catch(err => Promise.reject(err))
}
async start() {
if(this.status) return;
this.progress = 0
this.updateProgress(this.progress);
document.body.append(this._container);
this.status = true;
let countProgress = 0;
for(const [key, item] of Object.entries(this.urls)) {
this.__download(item.url)
.then(async () => {
this.progress += 1;
this.updateProgress(this.progress);
countProgress -= 1
})
.catch(e => {
countProgress -= 1
console.error(e)
})
countProgress += 1;
while(true) {
if(countProgress <= 5) break
await new Promise(res => setTimeout(() => res(), this.PAUSE_TIME))
}
console.log("Progress " + key)
}
}
updateProgress(current) {
const event = new CustomEvent("update", { detail: { current, total: this.urls.length }});
this._count_files.dispatchEvent(event);
}
}